Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d13a6523c82f4b…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 11:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f536317c03be624887e1c386f869cdf SHA-1: 2b768cf850246cc667a0f4cb152635f8339cbc87 SHA-256: 18d13a6523c82f4b6806674cfe574f12e3cccc7e0b2b03fe46d2acea06190d2e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=day+to+night+live+wallpaper PDF link annotation
    • http://kelvista.lt/images/files/34486748500.pdfIn PDF document text
    • http://henca.com/files/details/file/9549642169.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/55688452840.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/94500128606.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/xafireduwipiluwimajepo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137713a7b96b---vewifaxalajoxed.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/rojobefokovet.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/nivirowov.pdfIn PDF document text
    • http://goldmustang.com/files/files/7620391911.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/43455135626.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202196154322.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a847aaeda---xofamipoxif.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/furabuxonebalutopitim.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/pepelizuxozip.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/bojovamiwabuwu.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/96355701189.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/88874026456.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/dubobibozexutitiri.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/63803890314.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pmp222kg94vtih0c0sq909b2c7/41454155623.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/dovuvaximigaviv.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161429e115babc---64210333129.pdfIn PDF document text
    • http://ranchobg.com/img/file/worudajobonomexexirogen.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 16612 bytes
SHA-256: 0c6e6fbee34d1e427b5607cf94821ac44d93a1f8c00c634e2a5e9a44756a52b3
font_02_sfnt_off00010089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 10628 bytes
SHA-256: e39879c856475817905228eafd77811e48a087fdcf99b1fdbfa210f273a3f0e8

Open this report in the interactive analyzer, or submit your own file for analysis.